The following is a brief overview of how email over IPv6 works in Office 365, and why we are doing some of the things we are doing. Other services that also support email over IPv6 work similarly.
Source: A plan for email over IPv6 on Slideshare
Related Articles:
- Support for Anonymous Email over IPv6 in Office 365
http://blogs.msdn.com/b/tzink/archive/2014/10/28/support-for-anonymous-inbound-email-over-ipv6-in-office-365.aspx - How to create Allow rules for senders in Office 365 over IPv6
http://blogs.msdn.com/b/tzink/archive/2014/10/28/how-to-create-allow-rules-in-office-365-for-senders-over-ipv6-and-also-for-ipv4.aspx